TOPIC: hosting crash

So I use hostgator, shared hosting, and it crashed today. I am on 1.8 (the latest, cannot get into see the exact version). Should I look for a new hosting provider, or dedicated hosting? I have optimized all the php settings, we generally have about a 100 question survey, with about 20,000 users but sometimes up to 100,000 users.

OK, a 100 question survey with 20.000 - 100.000 respondents for sure is nothing for a shared hoster like hostgator. I think with this type of surveys you should even invest in a own dedicated server.

About the other aspects: I have no idea. But to me it doesn't look right. I don't think that this comes from Limesurvey, especially as it is in the public_html folder and your limesurvey installation is in the subfolder "limesurvey2".